Expansible mandrel



May s, 192s. l, 1,668,990

I W. E. TROMBLAY EXPANSIBLE MANDREL Filed Feb. 12, 1925` /y INVENTOR- l Hrw-ORN vs Patented May 8,1928. I Y

"UNITED STA WILLIAM E. TROMBLAY, 0F FULTON, NEW YORK.

EXPANSIBLE MADREL.

, Application led February This invention relates to an expansible mandrel or core for heavy paper rolls and analogous uses, the main object being to provide an expansible mandrel of this type which is comparatively light, strong and du rable and may be easily and quickly expand ed or contracted by a suitable operating means at one end thereof.

Another object is to provide means whereby the expansivesegments may be easily and quickly assembled and held in operative position against accidental displacement and at the same time rmly locked to the supporting shaft. j

Other objects and uses relating to specific parts of the device will be brought out in i the following description.

In the drawings:

Figure 1 is a perspective View of anv expansive mandrel embodying the various features of my invention.

Figure 2 is a longitudinal transverse sectional viewof the same taken on line 2-2, Figure l. l

Figuresy 3, 4 and are enlarged, transverse, sectional views taken respectively in the planes of lines 33, 1 -4; and 5-5, Figure 2. 1 y

As illustrated this device comprises a central shaft- 1H havinghopposite threaded ends -2f and -2- and a series of, in

this instance, three intermediate collars --3-k and -3 having `conical ends -1- facing in the same direction or toward one end of the shaft, said collarsvbeing arranged in axially spaced relation and adjustablefaxially on thel shaft and are held in their adjusted positions by set screws -5-, F igures 2 and 4.

A plurality of, in this instance, three cylindrical segments -6- are arranged cir- 'cumferentially around the shaft `-1- and collars #-3- and extend lengthwise of the and tof-and secured theretov by screws` '--8-, Figures 2 and 5, said collar segments being provided with conical faces -9- arranged to engage the conical facesi-4 of the corresponding collars -3 and -3-.

`of nuts 1a, 1925. serial No. 3,749.

and incidentally the shaft -lagainstrelav tive rotary movement while permitting a limited relative axial movement for a pur pose presently described.

The cylindrical segments 6iwith their collar segments '-7-7 and the shaftv f1-- j with its collars 3- and -SL-are adjustable axially relatively to each other by meanl j or adjustable end heads *l2- rand -12 which engage the threaded portions 2- of the shaft -1- at opposite ends of the segments -G-` one of said nuts as l2- being engaged directly with the adjacent end of the segments while the nut -l2fengagesa washer l3- which, in turn, engages the adjacent ends of the cylindrical segment -6 so that when both nuts are tightened the segments ti-and shaft .1- `will vbe held against relative endwise movement. Y j

On the other hand by loosenin one of the nuts and tightening the other, t esegments -6- and` shaft -l-l-f may be removed ailiiall relatively to each other. i

I* or example, ifit is desired to expand the mandrel by moving the segment outwhich will cause-the conical ends ofthe collars -3 to ride against the conical faces -'9- of the collars -7- therebyjforcingr the segments 6,- outwardly and radially. By reversing the direction of rotation of the nuts -12- the shaft -1-' with its collars ,3- will be drawnendwise a sufficient distance to disengage the conical portions -4- from the conical faces ,-9-

thereby allowing the segments 6% to move inwardly toward the axis of the shaft. j

The axial adj ustability of the collars 3- and- +3- on the shaft 1f-l permitsfthe f collars to beset 4to engage their respective segments -7- simultaneously and thereby to exert equal pressure or release at different portions of the segments -6- throughout their lengths. e e

Suitable means is provided for holding the' cylindrical segments -6- in equally spaced relation circumferentially and for this purpose a. pair 0f sleeves -14-,- and -14 are placed within oppositeends of the segments around the adjacent portions of the shaft 1- at the outer ends of the end collars -3-, the sleeve -14- being provided with a series of, in this instance, three radial slots -15 in equally spaced relation circumferentially and axially elongated from their 'outer ends for receiving suitable studs -16- on the adjacent ends of the segments -6-.

These studs -16- eXtend inwardly some distancebeyond the inner face of the sleeve -14- to allow a limited radial movement of the segment -6- and are provided at their inner ends with heads '-16- for limiting the outward movement. of the segments and thereby holding them in operative position ready for use. n

The collar -letfd is also provided with a plurality of, in this instance, three radial slots -larranged in uniformly spaced relation circumferentially and elongated "axially from their inner ends for receiving a corresponding number of studs i8a on the adjacent ends of the segments -6- for additionally holding said segments in uniformly spaced relation circumferentially.

These studs -18- also entend inwardly beyond the inner Jace of the sleeve Mldto permit limited radial movement ot the segmentsy and are provided'on their inner ends with heads -l8 for limit-ing the outward Vmovement ofthe segments and thereby assisting `and holding saidsegments against displacement from the sleeves except as hereinafter provided.

In order to remove the segments --6- 'from the shaft it is necessary to first unscrew the nut -l2- a sufficient distance to permit the washer -13- and sleeve -l4;- to be withdrawn endwise from within the `adjacent ends of said segments and then to unscrew the nut l2- a suiiicient distance to permit the studs --l6- to be displaced endwise from the slots J5- k by a corresp'onding endwise movement oi' the segments -Gfwhich is permitted by rocking the previously loosened ends of the segments "outwardly or radially far enough to permit the collar segments 7 to clear their companion collars -3- and -8- whereupon the endwise movement of the segments in the direction of the previously removed nutv -12- and disengage the lugs -16- from the slots -15- and thus permit the removal of the segments Jfollowing which the sleeve #14- may be removed endwise or axially.

'When assembling the segments -6- the sleevey 1ais first placed upon the adjacent end of the shaft -l and against the outer end face ot the adjacent collar -3- whereupon the segments may be successively placed in operating position by interlocking their respective lugs --16- inl the corresponding slots l5- after which the opposite ends of the segments -6- are moved inwardly towardthe axis of the shaft and the sleeve -liL- is then placed in operative position with its slots registering with the studs -l8-.

rl`he nuts -12- and 1Q/ may then be placed iu operative position upon the threaded portions -Q and tightened to lock the shaft and segments together against relative rotary movement, it beingunderstoodk that the segment having the slot -llwill be placed in position to engage the lug l0n 'tor holding 'the shalit and segments --6-v against relative rotary movement while the studs -land -18 cooperating with their respective slots -15 and 17- of the sleeves -1eland 145- Serve to hold the segments in uniformly spaced relation circumferentially.

The expansion of the mandrel may be accomplished by simply loosening the nut --12 and tightening the nut #12@- while the diverse operation of the nuts allows the mandrel sections to contract.

It is, ot course, understood that one or more washers -13 may be used at either end of the mandrel. or may be entirely omitted depending upon the amount of adjustment which may be necessary to eiect the desired expansion and contraction of the segments -6-.

that I claim is:

l. An expansible mandrel having radially movable segments arranged about a common axis, a sleeve disposed within said segments around said common axis and having lengthwise slots open at one end and studs on the segments projecting into theslots for holding the segments in ciroumterentially spaced relation, said studs having means engaging said sleeves to limit the Vradial movement of said segment, and means on said shaft tor moving said segments radially and out-- wardlv. l

2. n eXpansible mandrel having radially movable segments arranged about a common axis, a. sleeve disposed on the inner sides'oi. said segments about said common axis haviug lengthwise slots extending inwardly from one end thereof', and lugs on the segments projecting into said slots for holding the segments in spaced relation, said lugs having heads co-operating with the sleeve to limit the outward radial movement o't' the segments, means :tor relatively adjusting the segments and shaft axially, and adjustable means including collars having circular truste-conical surfaces for moving the segments radially and outwardly.

8. An expansible mandrel comprising a shaft radially movable cylindrical segments arranged about a shaft, said shaft and segments being relatively movable endwise, a

sleeve disposed on the inner sides ot said segments and having lengthwise slots registering with the segments and open at one end, and lugs on t e segments slidable radially and lengthwise in -the slots, said segments and shaftY having means for moving the segments radially by said relative endWise movement, said lugs engaging said sleeve to limit the radial movement ,of said segments and hold them in spaced relation.

4. An expansible mandrel having radially movable segments arranged about a shaft, sleeves at opposite ends of the segments and each provided with lengthwise slots registering with the segments and open at one end, lugs on the segments projecting through the slots for holding the segments in spaced relation circumferentially, and cooperating means on said shaft and segments for moving the latter radially and outwardly.

In Witness whereof I have hereunto set my hand this 24 day of January, 1925.

WILLIAM E. TROMBLAY. 

